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Transformers

We stand for the highest quality in the technological development of power and distribution transformers, mobile and portable solutions as well as maintenance services.

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Three workers in safety vests and helmets examine a power transformer indoors.

Transformers

We stand for the highest quality in the technological development of power and distribution transformers, mobile and portable solutions as well as maintenance services.

1949

Production of the first
distribution transformer

>100,000

Transformers
manufactured

114

Countries with
Efacec transformers

>2,300

Utilities powered
by our transformers

1949

Production of the first
distribution transformer

>100,000

Transformers
manufactured

114

Countries with
Efacec transformers

>2,300

Utilities powered
by our transformers

Power Transformers

Highly efficient solutions for large-scale power generation and transmission system.

Our Core and Shell type power transformers have an outstanding track record of performance, reliability and resilience, making them essential products for the networks of the future, that will require more flexibility, dynamic loading and maintenance, enhanced sustainability and real time monitoring.

Efacec’s Shell Power Transformers Technology adds unique features due to its design flexibility, modularity, and dissociated phase configurations as a solution for challenging transport scenarios.

Large green Shell-type transformers and overhead power lines at a power station, under a clear blue sky.

Shell

Up to 1500 MVA and 525 kV (BIL 1675kV)
Efacec Modular Transformer installed in a substation under a blue sky, with a label specifying power of 150 MVA.

Core

Up to 350 MVA and 525 kV (BIL 1675 kV)

Distribution Transformers

Optimal efficiency for electricity distribution networks.
Our distribution transformers feature compact designs and advanced insulation technologies, ensuring reliable performance with minimal energy losses, enhancing grid stability and supporting the integration of renewable energy sources.
Large, dark grey, oil-immersed distribution transformer inside a factory, surrounded by similar transformers.

Oil-immersed

From 50 kVA up to 25 MVA and 72,5 kV
Sustainable transformer in dark grey displayed in an industrial setting.

Eco-friendly fluid immersed transformer

From 50 kVA up to 25 MVA and 72,5 kV

Mobile & Portable Solutions

Optimised mobility ready to improve grid resilience.

Our solutions provide a fast and reliable alternative to traditional power transformers or substations, allowing for quick recovery during energy interruption on the distribution and transmission grids.

Designed for flexibility, the modular equipment can be installed on a single or on multiple trailers, ensuring efficient deployment tailored to your needs.

We have more than 200 units, deployed worldwide, in Core and Shell technology with up to 90 MVA and 245 kV.

A large, white transformer installed on multi-axle trailer, parked outdoors under a blue sky.

Conventional or hybrid isolation power transformers
Air, gas, or hybrid insulated equipment

Red truck towing a white, large transformer and cooling units.

Single or multiple trailers, and portable skid or container modules

Maintenance Services

Your assurance of safety and efficiency.

We have a comprehensive range of solutions that offer specialised support for power and distribution transformers.

Repair and Service competences are based on decades of own technology development and production, both on Core and Shell technology.

Our services include testing and diagnosis, inspection, installation and commissioning, repair, revamping and monitoring.

Worker in safety harness observes the lifting of heavy orange protective tubes for a large transformer.

Installation and commissioning

Technician in a safety vest carrying out maintenance services on an electrical control panel of a transformer, using a multimeter.

Maintenance and refurbishment

We are recognised worldwide as a leading European manufacturer of products and solutions for the production, transportation and distribution of electrical power.

Flagship projects

Large Generator Step Up Shell-type transformer with multiple cooling units and tall conductors.

GSU Shell type transformers for a nuclear power plant | United States

Supply of four Generator Step Up (GSU) Shell type transformers (two 750 MVA 500 kV and two 760 MVA 230 kV) for a nuclear power plant, with two of them being directly connected to the reactor.
Large, dark grey, oil-immersed distribution transformer inside a factory, surrounded by similar transformers.

Frameworks distribution transformers | United Kingdom

Since 1989, Efacec supplied more than 30,000 distribution transformers to all major utilities in the United Kingdom, from 50 kVA up to 24 MVA; 6.6 kV up to 33 kV.
Large power substation with several power transformers and electrical equipment installed at the French Alps.

Renewal of the high voltage transmission lines of the Haute Durance | France

Set up of a small factory and a high voltage lab, on site, to assemble and test three 170 MVA power transformers, at the French Alps – Haute-Durance, L’Argentière and Pralong substations, securing power supply to the region.
Large, light-gray transformer installed in a substation in Spain, amidst other electrical equipment and utility infrastructure.

Shell type transformers to modernise the Spanish transmission network | Spain

Supply, assembly and commissioning of 12 power transformers for substations on the 400 kV transmission network in peninsular Spain and the 245kV network in the Balearic Islands.
Large, grey power transformer connected to overhead power lines in a hydroelectric complex.

More than 10 transformers for the Alto Tâmega hydroelectric complex | Portugal

As part of one of the largest hydroelectric projects carried out in Europe in the last 25 years, Efacec supplied 410 kV power transformers (245 MVA, 90 MVA and 65 MVA) for the Daivões, Gouvães and Tâmega plants.
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